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Hi there I wanted to put a couple of resources here that can help to add to Everett's already great answer. Check out these: Should I Rebrand and Redirect My Site? Should I Consolidate Multiple Sites/Brands? (Moz) Web Site Migration Guide - Tips For SEOs (Moz) Hope these help answer your questions! Good luck!

I had a quick look at your site and there are a few things you can do.  Below is a must do technical audit. I would work through the list and identify opportunities. https://moz.com/blog/technical-site-audit-for-2015 I would also check page speed. - a site with a number of tools to check your site is website-tools.net Get started on the site audit  lets see how you go.  feel free to ask any questions. .